Feeding melengesterol acetate (MGA) in advance of estrus synchronization of virgin beef heifers
نویسندگان
چکیده
منابع مشابه
Estrus Synchronization and Pregnancy Rates of Beef Cows Administered Melengesterol Acetate the Ten Days before Estrus Synchronization with Syncro-mate B
treatments the cows were randomly assigned to two groups. One group of cows (n= 281) was fed 0.5 mg of melengestrol acetate (MGA) per head per day for ten days while the other group of cows (n= 257) served as controls. All cows were bled for progesterone concentrations at the beginning of the MGA feeding (d -21), before the SMB treatment, and at the time of artificial insemination (AI). Twenty-...
متن کاملReview of Estrus Synchronization Systems: Mga
The beef cattle industry has seen rapid gains in economically desirable traits largely due to the selection and expanded use of genetically proven, superior sires made available through artificial insemination (AI). Recent surveys indicate, however less than 5% of the beef cows in the United States are bred by AI, and only half of the cattle producers who practice AI use any form of estrus sync...
متن کاملEstrus Synchronization Protocols for Heifers
Estrus synchronization and artificial insemination (AI) remain the most important and widely applicable reproductive biotechnologies available for cattle (Seidel, 1995). Although hormonal treatment of heifers and cows to group estrous cycles has been a commercial reality now for over 30 years, beef producers have been slow to adopt this management practice. Perhaps this is because of past failu...
متن کاملComparison of long-term progestin-based estrus synchronization protocols in beef heifers.
Two experiments evaluated long-term progestin-based estrus-synchronization programs on the basis of potential for use in facilitating fixed-time AI in estrous cycling and prepubertal beef heifers. In Exp. 1, heifers were assigned to 1 of 2 treatments by age, BW, and estrous cyclicity status. Heifers assigned to the melengestrol acetate-PGF(2α) protocol (MGA-PG; n = 50) received MGA (0.5 mg·anim...
متن کاملDevelopment of an estrus synchronization protocol for beef cattle with short-term feeding of melengestrol acetate: 7-11 synch.
An estrus synchronization protocol (7-11 Synch) was developed to synchronize the first follicular wave and timing of ovulation in postpartum beef cows. In Exp. 1, follicular development and timing of ovulation in response to the following protocol were evaluated. Beef heifers (n = 12) and cows (n = 6), at random stages of the estrous cycle, were fed melengestrol acetate (MGA; .5 mg x animal(-1)...
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ژورنال
عنوان ژورنال: Kansas Agricultural Experiment Station Research Reports
سال: 2005
ISSN: 2378-5977
DOI: 10.4148/2378-5977.1599